Safety cylinder cock



Nov. 1, 1927.

M. R. FEELEY ET AL SAFETY CYLINDER COCK gnbentcwi Ndv. 1., 1927. 1,647,826

M. R. FEVELEY ET AL SAFETY CYLINDER COCK Filed Jan. 21. 1926 2 Sheets-Sheet 2 60 25' ll 6 7 'l 2/ L .n: CF ml 25 65 I r Patented Nov. 1, 1927.

oNrrEo STATES PATENT OFFICE.

lVIAT'lI-IEVJ R. EEELEY, OE SCRANTON, PENNSYLVANIA; CHARLES STERN, OF JERSEY CITY, NEW JERSEY; AND RICHARD VJ. BEADEN, OF NEW YORK, N. Y., ASSIGNORS TO B-S MANUFACTURING PRODUCTS CORPORATION, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEN JERSEY. V

SAFETY CYLINDER COCK. 7

Application filed January 21, 1926. Serial No. 82,817.

The present invention relates to improveat its upper end provided with the external ments in safety cylinder cocks and conslsts pipe thread to screw into an opening in the in certain improvements in the device shown bottom of the locomotive cylinder. 55 and described in our prior similarly en- At the base of the hollow neck 22 and titled application, filed November 7, 1925, interiorly of the casing is a seat 23, pref- Serial No. 67,642. r erably a frusto-conical seat which may be The objects of both inventions are to proconveniently and accurately ground fo th vide for the automatic release and evacuatight seating thereagainst of the conical 60 tion of the water trapped in the locomotive valve seat 2% on the movable piston valve 25. 1O cylinders to prevent the blowing out of the The piston valve is illustrated removed from cylinder heads from this cause. the casing in Figures 5 and 6, and it is The present invention, in addition to posmade with an upper reduced part forming sessing' the same advantages as that dea stem 26 carrying the cone valve seat 24 65 scribed in our co-pending application aforeat its upper end. Above this cone Valve seat said, secures the further new result that the 24: is an area of relatively small diameter exvalve is cushioned in its movement to avoid posed through the hollow neck 22 to the its seating violently attented with considerpressure within the locomotive cylinder. bl i The lower-larger piston portion 25 is mount- 7 A further object of the invention lies in ed to reciprocate in the cylinder 27 of the v providing a new and improved construction casing and the bottom of the piston preto render the device more secure against the sents a much larger area than that of the leakage of the compressed air which is used top above the valve seat 24. Air, steam or to seat the valve and keep it normally seated 7 other pressure is admitted through the laterexcept when the water pressure in the loco 211 port 28 to the bottom of the piston 25 25 motive cylinder exceeds the air pressure. serving to hold the piston in the raised posilVith the foregoing and other objects in tion shown in Figure l. The port 28 may view, the invention will be more fully deconnect by a pipe, as indicated in Figures scribed hereinafter, and will be more par- 1 and 2, with a suitable source of pressure ticularly pointed out in the claims appended medium supply, for instance, the train air 30 hereto. line. p, p I

In the drawings, wherein'like symbols re- The piston 25, according tothe present infer to like or corresponding parts throughvention, is narrow in a vertical sense at its out the several views, 2 lower larger area and is provided with only Figure 1 is a longitudinal section taken a single groove 29 for receiving the single 35 through the improved device with the valve packing ring 30, which has a tight fit in-the seat-ed, r I wall of the cylinder 27 and prevents the Figure 2 is a section taken on the line 2-'2 scape of the pressure medium above the in Figure 1. piston. Figure 8 is a side view of the cushioned The guide stem 26 of the plston valve 0 auxiliary plunger. slides in the annular valve guide 31 formed Figure 4 is a vertical section taken at subin the interior of the hollow casing 21' above stantially right angles to Figure 1 and showthe cylinder 27 and just below the annular ing the parts in the lower position. chamber 32. In fact the lower wall of the Figure 5 is a side view of the piston valve. annular chamber c 32 is constituted by the 45 Figure 6 is a top plan view of the same, annular valve guide 31. VA sliding fit is and i made between the valve guide and the valve Figure 7 is a bottom plan view of the stem 26 for two purposes, first, to cause the cushioned auxiliary plunger. valve and piston to move in a true axial line,

Referring more particularly to the drawwhereby the valve may seat accurately at its 50 ings, 21 designates the casing or shell which upper end; and secondly, to prevent the pasmay be of the generally cylindrical form sage, as much as possible, of the water and shown having the contracted hollow neck 22 steam down tothe upper part of the cylinring shaped auxiliaryplunger 61.

der 27. Should such steam escape to this point however, it will be received in the upper part of the cylinder 27 at which point a lateral drain port 34 provides for the es isof an external diameter to-lit the cylinder wall 27, while it is of ring shape with hollow interior to lit loosely about the stem 26 of the valve plunger. On its outside wall the auxiliary piston60 is provided with-one or more annular grooves (ii for receiving the packingrings 62 for the purpose of preventing leakage above or below the auxiliary piston tiO-andthus preventing the water and steam from above getting into the air chamber below the 'piston 25 or the air from escaping upwardly. This leakage is further avoided by the internal :lrusto-conical seat 63 mace uponthe inner lower edge or" the The seat ,63 is made to conform to the auxiliary valve seat 36 on the plunger valve and these conical surfaces form the point of contact between the piston valve and the auxiliary cushioned piston 60. Leakage is thus avoided by this seat and these parts are kept seatedat all times by the action of a coil spring 64 wound about the stem 26 and hav-' 111g its upper end disposed against the annu-' lar uide 31 which forms an abutment for b a a i r'w this upper end or the spring. The lower end of the spring hts against shoulder 65 made upon an inwardly projecting lower portion of the ring 60.

Above this shoulder 65 the ring is of reater diameter to permit the coil s Jring 64 to pass freely therethrough. VThe force of the coil spring 64 devolves upon the shoulder 65 and inasmuch ;as this shoulder 65 is directly opposite the conical valveseat 63 a tightseating is ways had, the force of the spring being e11 pended in a direct line to cause this seating. li iloreover the spring acts at the shortest diameter of the cone thus being. more er"- ficacious in action. The parts are preferably so arranged and designed that the upper end of the auxiliary cushioned plunger 60 is with internal screw threads to receive the spaced below the guide 31 and preferably below the lateral vent 34 in the uppermost position of the plungervalve.

The bottom of the cylinder 27 is provided threads provided upon the cap 41. The cap is perforated centrally to receive thethreaded stop pin 43 the head 44 of which is disposed within the cylinder 27 to be engaged by the bottom of the plunger 25 in the fully open position of the parts. A packing or washer 45 is placed about the shank of the stop pin and compressed by the head 44 against the inn-er surface of the cap 41. This washer will avoid leakage. The stop pin projects outwardly beyond the cap 41where be provided with a hexagonal nut portion below the flange 49 for f moval and replacement. The operation of the device is as follows:- p I The plunger 30, which reciprocates in the cylinder 21 is in onefpiece with, or attached acili tating its refixedly to, the valve 24,v-zhe reby the two move in unison. The diameterof the plunger 30 is greatly in execs" of the diameter of the valve 24 and consequently a light .air pressure beneath. theplunger 30 will serve to keep the valve 24closed against the greater steam pressure within the cylinder which has access at all times to the upper face of the valve v24. The airpres lure received in the lower part of cylinder All through the pipe connected at 28 may originate from the locomotive reservoir or from any other suitable source of airpressure. ll] hen water accumulates sufiiciently in the locomotive cylinder to which the neck 22 is connected, the pressure ontopof the valve 24 will exceed the air pressure beneaththe plunger causing the valve to open. Figure shows the fully open position where the locomotive cylinder is evacuated, the water and steam having access to the annular chamber 32 and chamber, shown in Figure 1, is provided with the lateral cut away port-ion or. exhaust port 37. Any water or steam down. past the guide 31 will be evacuated through the vent 34.

l hen th locomotive cylinder has been suniciently evacuateth sothat the pressure above the valve 24 drops below that of the pressure beneath the plunger ilo, such plunger valve will tend to close. Thesp'ring 64 will cushion the closing moven nt of-the valve and prevent the valve face 24from striking the valve seat 23: and with great violence attended by loud noise- Where the valve is permitted to seat only slowly and lightlythe pitting ofthe valve seat is provented and a tight fit is insured. The coil spring 64 will become compressedas the valve approaches, the closed position and will exert a progressively increased opposition to the closing nlovenientg- This will also at the sametime preserve a tight joint at the valve seats 35 and 63.

Another, important. function subserved by the cushioned auxiliary plunger is the conservation of the air pressure below the piston 25. This train pressure is maintained only at considerable expense and the wasting of air pressure is intolerable. Moreover the bleeding of the air line is apt to cause actuation of other devices controlled thereby.

If desired steam pressure might beused,

.= This water is shoved by the piston against the cylinder head and results in the yielding of such cylinder head. In order to make the device particularly responsive in emergencies of this kind, the piston is made in two parts, namely, in the parts 30 and 60. As a consequence the piston 30 and its connected valve 24 are lighter in construction. Moreover the piston 30 is narrow vertically and carries only a single packing ring. Packing rings exert a frictional or dragging effect on the movement or action of the piston and consequently this dragging movement on the piston 30 is reduced to a minimum, at the same time preserving the tightness which will prevent the tree escape of the very costly compressed air. At the same time an extremely effective packing is provided by the auxiliary piston 60 with its elongated vertical surface and two packing rings. This piston 60 is urged by the coil spring 64 against the piston 30 and acts for the most part as a unit with the piston 30. However, when excessive pressure builds up in the locomotive cylinder, this pressure may quickly force down the valve 24; and plunger 30 to permit escape of the accumulated water before the cylinder head gives away; this action taking place without the dragging effect of the auxiliary piston 60. This auxiliary piston will, however, quickly follow and by virtue of-the valve seat 36 the main and auxiliary pistons will be again bound together in a united whole. M

It is obvious that various changes and modifications may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following I claims.

What is claimed is This is a disastrous sequence 1. An improved cylinder cock comprising a casing having connection to a locomotive cylinder and having an outlet for the steam and water with a valve seat between said outlet and the locomotive cylinder, a piston valve movably mounted in said casing and having a valve seat to close against said casing valve seat, means for supplying an elastic fluid under pressure to said casing and against said piston valve whereby to hold the piston valve yieldably closed, an aux-' iliary seat on said piston valve, and a yieldably urged auxiliary plunger having a seat for closing against the auxiliary seat on said piston valve.

2. An improved cylinder cock comprising a casing having connection to a locomotive cylinder and an outlet for the steam and water with a valve seat between the outlet and locomotive cylinder, a piston valve movably mounted in said casing and adapted to close against said casing seat, said piston valve having a reduced stem with a conical auxiliary valve seat at its base, an auxiliary plunger movably mounted in said casing and being of ring shape with a lower inwardly pro ecting portion having its lower edge formed complementary to said auxiliary valve seat of the piston valve, and a coil spring extending about said stem within the ring shaped auxiliary plunger for urging the latter and the piston valve downwardly.

3. An improved cylinder cock comprising a casing adapted to have connection to a locomotive cylinder and provided with an outlet for the steam and water with a valve seat between the locomotive cylinder and the outlet, a cylinder in said casing having communication at its lower portion with a source of compressed air supply and having a vent at its upper portion, a thin piston fitted to reciprocate in said cylinder and having small frictional resistance against the cylinder wall, said piston having a remotevalve seat for closing against said casing valve seat and a proximate valve seat, an elongated auxiliary piston fitted to slide in said cylinder adjacent said thin piston, said auxiliary piston having an internal valve seat adapted to engage against the proximate valve seat of said piston, and yieldable means for urging said auxiliary piston toward said firstmentioned piston.

MATTHEWV R. FEELEY. CHARLES STERN. RICHARD W. BRADEN.

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